The descendants of the ancient Olmec (Vera Cruz area of Gulf of Mexico) have legends their ancestors (7 brothers) came to their land on the backs of 7 turtles from the west. The Olmec date from approx. 2,500 B.C.or earlier. (sorry PC afficiandos, I don't use B.C.E.) Further, the Olmec and Mayan calendars have a starting date near or around 3,100 B.C. when some prominent, and as yet unknown, event occured.
You Mormon bashers won't like this, but the Book of Mormon mentions a people referred to as "Jaredites" who came to the americas shortly after the Tower of Babel (around 2,500 B.C.) in 8 ships made "...tight like a dish..." (a turtle shell would also be a good description) from the west. The core group of these Jaredites were from one family (brothers) and their friends.
Coincidence? You decide....
If the evidence in Brazil is the oldest, I kinda like this west africa to Brazil theory. The shortest distance (other than across Scandanavia to Greenland to Iceland to Vineland) is from the west african bulge to the Brazilian bulge.
I can then see migrations south and over to Chile and up the west coast of SA. Or up the nile and over the Andes? Etc, etc. That would account for inca, mayan and then US Indians.
I like this stuff. That stuff in New England is virtually unknown except to Blue State Bluenoses, kinda a cult.
yitbos